Ombuin is an O-methylated flavonol, a type of flavonoid.
Ombuin can be found in species of the genus Erythroxylum.
[1] Ombuin 3-sulfate can be isolated from Flaveria chlorifolia.
[2] Ombuin-3-rutinoside can be isolated from Phytolacca dioica, the ombu tree.
[3] Ombuin-3-O-rhamnosylglucoside can be found in Erythroxylum rufum.